Wili-ielm jasper



UNITED STATES PATENT OFFICE.

. WILHELM JASPER, OF NEW YORK, N. Y.,'A'ssIeNoE OF ONE-HALF TO MAX MINDH'EIM, OF SAME PLACE.

EXPANSIIBLE 'PULLEY.

SPECIFICATION forming part of Letters Patent No. 593,895, datedNovember 16, 1897.

Application filed March 12, 1827. SerialNo. 627,206. (No model.)

To all whom it may concern/.-

Be it known that I, WILHELM JASPER, a

citizen of the United States, residing at New expansion-pulley.mbodying certain novel features of construction, as set forth in the following specification and c lai'msandillustrated in the annexed drawings-,'in which' Figure 1 is a side elevation of alternating ex-' pension-pulleys, one pulley being sectioned.

Fig. 2 is a ,face view of a pulley of.Fig. 1. Fig. 3is asection along line as 00, Fig. 1. Fig. 4 isasection alon'gline'y y, Fig.1. Fig.5is asection along .2 z, Fig.2: Fig. 6 is a detail view.- 1

The disks 1 and 2 are own withconcen trio axles 3 and 4. These axles or shafts are tubular, theaxle 3 of disk lbeinginclosed in axle of disk 2, so that each disk with its axle can be rotated relatively to the otherdisk and axle.

radiating slots 5 and adjusting-disk 2 with helical slots 6. v

-The belt-supporting lugs or bearing-pieces 7 are shown seated against a face of disk 1- i with their stems-8extended through slots 5 and 6-. The stenis8 are suitably held in place,

Theidiskl is shown with rectilinear as by plates 9, secured by bolts or fastenings 10. The shaft;3 isshown with a rectilinear groove'll andshaft at with helical groove 12.

Aro

shafts 3'and4 with their disks; 1- and 2 to rotate withir'espect to one anothe-n' The walls of helicalsl'ots 6 thus acting on ems 8 cause the latter, with bearing-pieces {to slide or be adjusted along the radial orguiding slots 5 toward or from the center of shafts 3 and 4. The radialrectilinear' slots 5 guide the.

one pulley is expanded the other is contracted,-

l'ler-stud 13 engages said grooves 11 and 12. This stud 1-3-is carried by sleeve 14, engaged by fork 15 of a. lever or shifter 16 and 17, fulcrum'ed at 18. When the sleeve'l tis and vice versa. By spreading or concentrating the bearing-pieces 7, as stated, a belt suptightening or. bearing.

The walls of the guiding or rectilinear slots 5 are shown channeled, as at 19, Fig. 5, and

. the bearing-stems 8 have tongues 20 fittedyor ported on such pieces can be given a suitable guided in said channels, so that the stems will bolts 10,n'iay be omitted, as the tongues 20 will prevent stems 8 from dropping or slipping out-of place. 1 e

It is of course evident thatthe device may 'be modified ,as the guide-slots 5 need not be strictly rectilinear or might be placed at an angle to their position, as shownin Fig. 2, and still guide the bearing-pieces 7 from and toward the pulley center, also, in using two or more pulleys it is not necessary that the helical or screw-thread slots or grooves 6 and 12 of the various pulleys should'all corre- T Spondin pitch or size with one another. Such variations might be made and the relative rotation of 'disks 1 and 2 of a pulley would stillefiect' an adjustment of the bearingpieces of such pulley.

-'seen. in.Fig. 6, where the stud 13- is shown 'The'stud 13 is practically made four-sided with-four faces, two faces sitting againstthe edges of slot 11 and two faces sitting against the edges of slot 12. What'fcla'im as new,-and desire to secure by Letters Patent, is'

1. A guiding-disk and an adjusting-disk, combined with concentric shafts for the disks, and bearing-pieces engaged by said disks, said shafts beingv respectively provided with helical and rectilinear grooves, and a sleeve or shifter having. astud made to engage the grooves substantially as described.

2. A disk provided with rectilinear radial slots, combi ned with a disk provided with heli cal slots, bearing-pieces placed against one of the disks and having stems extended through said slots, concentric shafts for the disks provided respectively with rectilinear and heli-f cal grooves, and asleevc or shifter having a 3. A guiding-disk provided with rectilinear radial slots, combined with an adj ustingwlisk provided with helical slots, bearing-pieces placed against one of thedisks and having stems extended through said slots, concentric shaftsfor the disks provided respectively with rectilinear and helical grooves, and a sleeve or shifter having a stud made to engage said grooves, said guiding-disk having its rectilinear slot walls channeled, and said bearing-stems having tongues fitted into said channels substantially as described.

4. *The combination with a guiding-disk and an adj usting-disk provided, respectively, with rectilinear and helical slots, concentric shafts provided, respectively, with helical and rectilinear grooves and connected with said disks, bearing-pieces engaged with the slots of the disks, anda shifter movable upon one of the shafts and having a stud engaging the rectilinear and helical grooves of said shafts, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

VVILHELM JASPER.

WVitnes'ses:

. WILLIAM C. HAUFF,-

E. F. KASTENHUBER. 

